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\begin{tabular}{c|} If \( y=15-\frac{1}{x^{6}}+\frac{1}{3} x^{20} \), then \( y^{\prime}=\ldots \ldots \ldots \ldots \) \\ \( \frac{6}{x^{7}}+\frac{20}{3} x^{19} \) \\ \( \frac{6}{x^{5}}+\frac{20}{3} x^{19} \) \\ \( \frac{6}{x^{5}}+\frac{20}{3} x^{19}+15 \)\end{tabular}

Ask by Newton Ward. in Egypt
Mar 08,2025

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Answer

The derivative \( y' \) is \( \frac{6}{x^7} + \frac{20}{3}x^{19} \).

Solution

We are given \[ y=15-\frac{1}{x^6}+\frac{1}{3}x^{20}. \] We will differentiate each term with respect to \( x \). 1. The derivative of the constant \( 15 \) is \[ 0. \] 2. Rewrite the term \(-\frac{1}{x^6}\) as \[ -x^{-6}. \] Its derivative using the power rule is \[ \frac{d}{dx}\left(-x^{-6}\right) = -(-6)x^{-7} = 6x^{-7} = \frac{6}{x^7}. \] 3. The term \(\frac{1}{3}x^{20}\) differentiates as follows: \[ \frac{d}{dx}\left(\frac{1}{3}x^{20}\right)=\frac{1}{3}\cdot 20x^{19} = \frac{20}{3}x^{19}. \] Thus, combining these results, the derivative is \[ y' = \frac{6}{x^7}+\frac{20}{3}x^{19}. \]

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Extra Insights

Calculating the derivative of the expression \( y = 15 - \frac{1}{x^6} + \frac{1}{3} x^{20} \) reveals some interesting mathematical principles! First, it's essential to apply the power rule and the rules for derivatives of constant and negative exponents. Simplifying these gives us \( y' = \frac{6}{x^7} + \frac{20}{3} x^{19} \). This demonstrates how versatile derivative rules can be when handling various functions, including polynomials and fractions. Now, let's talk about a common pitfall! Many students skip the step of carefully applying the chain and product rules when they encounter more complex functions. As a result, they might mix up the derivative terms or overlook some constants. Taking your time to break down each component will help ensure you get that derivative correct and reinforce your understanding – because who doesn't love a good "aha!" moment in calculus?

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